Yes — you can try photo-based logging for free with a 3-day trial. Premium unlocks unlimited scans, detailed macro breakdowns, and advanced features like weight trends and health score.

★★★★★ 4.8 · 3M+ users worldwide

Stop guessing calories.
Start losing weight.

Q: How accurate is CalZen?

About 90% accurate for most meals.* For complex dishes like soups or smoothies, just add a quick description. Not happy with the result? Tap "Fix results" and CalZen learns from your feedback. *Based on published food recognition benchmarks and independent app evaluations.

Guessing portions is why your calorie deficit never works. CalZen's AI analyzes your food from a photo — accurate calories, protein, carbs, fat, and ingredients in seconds. Finally, tracking you can trust.

Join 3,000,000+ people losing weight the easy way

Beef Steak

400 cal

Mixed Greens

10 cal

Tomatoes

20 cal

Zucchini

15 cal

How it works

No scales. No databases.
AI calorie tracking in one photo.

Over 80%¹ of people quit calorie counting in the first week — because weighing every gram and searching food databases is exhausting. CalZen replaces all of that with one photo.

📸

Step 1

Snap a photo

No food scale needed. No searching "chicken breast 150g" in a database. Just point your camera at any meal — home-cooked, restaurant, or takeout. One tap and you're done.

⚡ 1 second

🧠

Step 2

AI does the math

CalZen identifies every ingredient, analyzes portion sizes, and calculates calories, protein, carbs, fat — the work that used to take 5 minutes now takes 3 seconds.

⚡ Under 3 seconds

📊

Step 3

Actually stick with it

When tracking takes seconds instead of minutes, you don't quit after a week. Your daily calories and macros update automatically — stay in your deficit without the mental load.

🎯 Effortless

¹ Health & fitness apps retain only 8–15% of users by Day 7 (AppsFlyer, 2025; Business of Apps, 2026).

Features

More than a nutrition tracker. Track your goal, not just food.

CalZen shows your weight trend first — because that's what matters. Calories, macros, and activity all feed into one clear picture of your progress.

Weight

73.2

↓ 4.8 kg

Weight log

Today

73.2 kg

−0.1

Mar 7

73.3 kg

Mar 6

73.3 kg

−0.1

Mar 5

73.4 kg

−0.1

See all →

Calories

1,050

of 1,650

600 left · enough for dinner

Macros

Protein

44g

Carbs

128g

Fat

29g

Today's meals

8:30

Oatmeal with banana

380 kcal

13:00

Pasta bolognese

520 kcal

16:00

Apple + almonds

150 kcal

19:00

Dinner — snap a photo

Water

1.5L

of 2.5L

Activity

Steps

7,842

Burned

312 kcal

Active

42 min

Steps

7,842

/ 10,000

312 kcal burned

MTWTFSS

Health score

7.2

/ 10

Balanced

✓

Protein

✓

Carbs

⚠

Fat

Real results

Real weight loss results from real people

Different goals, one app. Here's what CalZen users say.

★★★★★

ok this actually works

stuck at 78 kg for like 5 months. turns out i was eating way more than i thought lol. just started photographing everything and wow. 71 kg in two months.

Daniel K.

@danfit_92

↓ 7 kg

★★★★★

Best app for bulking

Need 160g protein a day. Other apps made me want to die. This one I just snap a pic and done. Lean bulk going great 💪

Marcus T.

@marc_lifts

↑ 4 kg muscle

★★★★★

Lifesaver with a newborn

Two kids, zero free time. I literally photograph my plate while holding the baby. Down 9 kg and my doctor asked what I'm doing differently.

Emma L.

@em_momlife

↓ 9 kg

★★★★★

A1c down!!

Doc said watch your carbs. Easier said than done right? This app shows carbs for literally anything I eat. 7.8 → 6.2 in four months. Worth every penny.

Robert J.

@rob_health47

HbA1c 6.2

★★★★★

One year and counting

Lost weight before with MFP. Gained it all back. Twice. CalZen is just so fast that I never stopped using it. Still 62 kg a year later. First time ever.

Sofia R.

@sofi.runs

Maintaining 62 kg

★★★★★

Wedding dress ✓

12 weeks. Restaurant dinners, work lunches, stress snacking — tracked it all with photos. Dress zipped up with room to spare 😭

Olivia W.

@liv_bride24

↓ 6 kg

The calorie counter people actually keep using

CalZen is the most advanced AI calorie tracker — everything to reach your goal, in one app.

⚡

Fast & effortless tracking

Snap a photo, get instant calories and macros. No scales, no searching. So fast you'll actually stick with it.

Fitness integrations

Steps, burned calories, water — everything flows in automatically. Your activity data makes calorie goals actually accurate.

Apple Health

Health Connect

📊

See your progress daily

Weight trend, calorie history, macro balance — all in one glance. Know exactly where you stand every single day.

🚀

New features every week

Recipes, meal plans, barcode scanner, AI improvements — something new every week.

FAQ

Questions? Answered.

Nine things people ask before they start tracking with CalZen.

How accurate is CalZen?

About 90% accurate for most meals.¹ For complex dishes like soups or smoothies, just add a quick description. Not happy with the result? Tap "Fix results" and CalZen learns from your feedback.

¹ AI models identify common food items with up to 90% accuracy (Rouhafzay et al., Frontiers in Nutrition, 2025; Khalili et al., Applied Sciences, 2025).

How does CalZen actually work?

Snap a photo. CalZen's AI identifies every item on your plate, estimates portions, and calculates full nutrition — calories, protein, carbs, fat — in about 3 seconds. No searching databases, no manual entry.

What foods can CalZen recognize?

Pretty much anything — home-cooked meals, restaurant dishes, packaged foods, drinks, snacks. If it's on a plate, CalZen can read it. For tricky cases, use Describe to type what you ate.

Is CalZen free?

Yes — start with a 3-day free trial to test all premium features. After that, you can continue with free photo-based logging or unlock unlimited scans, detailed macro breakdowns, weight trends and health score with a subscription.

Does CalZen work with Apple Health and Health Connect?

Yes. Steps, burned calories, water — everything syncs automatically. Your activity data makes calorie goals actually accurate, not just a guess.

Can I use CalZen for weight loss?

Absolutely. Most users start CalZen to lose weight. Set your goal, track what you eat with photos, and the app shows exactly where you stand every day. No guessing.

How is CalZen different from MyFitnessPal?

Speed. With MFP you search, scroll, pick, weigh, type. With CalZen you take a photo and you're done. Most people quit calorie tracking because it's tedious — CalZen fixes that.

How does CalZen handle my data?

Your data is encrypted and processed securely. We don't sell personal information. Full details in our Privacy Policy.

Why trust CalZen?

3 million+ users, 4.8★ on App Store, 4.7★ on Google Play. The app gets better every week — AI accuracy improves, new features roll out, and the team actually listens to user feedback. Thousands of 5-star reviews speak for themselves.

Stop guessing calories.Start losing weight.

No scales. No databases.AI calorie tracking in one photo.

Snap a photo

AI does the math

Actually stick with it

More than a nutrition tracker. Track your goal, not just food.

Real weight loss results from real people

ok this actually works

Best app for bulking

Lifesaver with a newborn

A1c down!!

One year and counting

Wedding dress ✓

The calorie counter people actually keep using

Fast & effortless tracking

Fitness integrations

See your progress daily

New features every week

Questions? Answered.

How accurate is CalZen?

How does CalZen actually work?

What foods can CalZen recognize?

Is CalZen free?

Does CalZen work with Apple Health and Health Connect?

Can I use CalZen for weight loss?

How is CalZen different from MyFitnessPal?

How does CalZen handle my data?

Why trust CalZen?

Start losing weight today

Stop guessing calories.
Start losing weight.

No scales. No databases.
AI calorie tracking in one photo.